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STOCKHOLDERS’ EQUITY (Tables)
3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Schedule of Common Stock Reserved for Future Issuance
Common stock reserved for future issuance is as follows (in common stock equivalent shares):
March 31,
2022
December 31,
2021
Common stock warrants12,517,328 12,517,328 
Series X Convertible Preferred Stock18,184,720 18,184,720 
Stock options, RSUs and PRSUs issued and outstanding10,847,996 9,470,178 
Authorized for future stock awards3,232,404 2,436,984 
Awards available under the ESPP1,170,564 680,228 
Total45,953,012 43,289,438